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cos α obliczam z jedynki trygonometrycznej
sin²α+cos²α=1
cos²α= 1-sin²α
cos²α=1 -5/9
cos²α=4/9
cosα= 2/3
tgα= sinα/cosα
tgα= √5/3 :2/3= √5/3*3/2= √5/2
ctgα= 1/tgα= 2/√5= 2√5/5